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Theorem 2ndval2 4090
Description: Alternate value of the function that extracts the second member of an ordered pair. Definition 5.13 (ii) of [Monk1] p. 52.
Assertion
Ref Expression
2ndval2 |- (A e. (V X. V) -> (2nd` A) = |^||^||^|`'{A})

Proof of Theorem 2ndval2
StepHypRef Expression
1 elvv 3228 . 2 |- (A e. (V X. V) <-> E.xE.y A = <.x, y>.)
2 visset 1813 . . . . . 6 |- x e. V
3 visset 1813 . . . . . 6 |- y e. V
42, 3op2nd 4086 . . . . 5 |- (2nd` <.x, y>.) = y
52, 3op2ndb 3451 . . . . 5 |- |^||^||^|`'{<.x, y>.} = y
64, 5eqtr4 1498 . . . 4 |- (2nd` <.x, y>.) = |^||^||^|`'{<.x, y>.}
7 fveq2 3724 . . . 4 |- (A = <.x, y>. -> (2nd` A) = (2nd` <.x, y>.))
8 sneq 2417 . . . . . . . 8 |- (A = <.x, y>. -> {A} = {<.x, y>.})
9 cnveq 3292 . . . . . . . 8 |- ({A} = {<.x, y>.} -> `'{A} = `'{<.x, y>.})
108, 9syl 10 . . . . . . 7 |- (A = <.x, y>. -> `'{A} = `'{<.x, y>.})
1110inteqd 2538 . . . . . 6 |- (A = <.x, y>. -> |^|`'{A} = |^|`'{<.x, y>.})
1211inteqd 2538 . . . . 5 |- (A = <.x, y>. -> |^||^|`'{A} = |^||^|`'{<.x, y>.})
1312inteqd 2538 . . . 4 |- (A = <.x, y>. -> |^||^||^|`'{A} = |^||^||^|`'{<.x, y>.})
146, 7, 133eqtr4a 1532 . . 3 |- (A = <.x, y>. -> (2nd` A) = |^||^||^|`'{A})
151419.23aivv 1296 . 2 |- (E.xE.y A = <.x, y>. -> (2nd` A) = |^||^||^|`'{A})
161, 15sylbi 199 1 |- (A e. (V X. V) -> (2nd` A) = |^||^||^|`'{A})
Colors of variables: wff set class
Syntax hints:   -> wi 3   = wceq 956   e. wcel 958  E.wex 980  Vcvv 1811  {csn 2409  <.cop 2411  |^|cint 2533   X. cxp 3168  `'ccnv 3169  ` cfv 3182  2ndc2nd 4078
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 962  ax-gen 963  ax-8 964  ax-9 965  ax-10 966  ax-11 967  ax-12 968  ax-13 969  ax-14 970  ax-17 971  ax-4 973  ax-5o 975  ax-6o 978  ax-9o 1123  ax-10o 1140  ax-16 1210  ax-11o 1218  ax-ext 1459  ax-sep 2703  ax-nul 2710  ax-pow 2742  ax-pr 2779  ax-un 2866
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 981  df-sb 1172  df-eu 1382  df-mo 1383  df-clab 1464  df-cleq 1469  df-clel 1472  df-ne 1587  df-ral 1649  df-rex 1650  df-v 1812  df-dif 2049  df-un 2050  df-in 2051  df-ss 2053  df-nul 2281  df-pw 2402  df-sn 2412  df-pr 2413  df-op 2416  df-uni 2504  df-int 2534  df-br 2620  df-opab 2667  df-id 2835  df-xp 3184  df-rel 3185  df-cnv 3186  df-co 3187  df-dm 3188  df-rn 3189  df-res 3190  df-ima 3191  df-fun 3192  df-fv 3198  df-2nd 4080
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